package com.atguigu.servlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class ContextServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取web.xml中配置的上下文参数context-param
        ServletContext context = getServletConfig().getServletContext();
        String username = context.getInitParameter("username");
        System.out.println("context-param参数 username的值是："+username);
        System.out.println("context-param参数 password的值是："+context.getInitParameter("password"));

        //2.获取当前的工程路径，格式：/工程路径  映射到IDEA代码的web目录
        System.out.println("当前工程路径："+context.getContextPath());

        //3.获取工程部署后在服务器硬盘上的绝对路径
        /**
         * /斜杠被服务器解析地址为：http://ip:port/工程名/ <br/>
         */
        System.out.println("工程部署的路径是："+context.getRealPath("/"));
        System.out.println("工程下css目录的绝对路径："+context.getRealPath("/css"));
        System.out.println("工程下imgs目录下0.jpg的绝对路径："+context.getRealPath("/imgs/0.jpg"));

    }
}
